Fix Time.from_seconds_after_midnight/3 not validates microsecond and produce invalid Time

[AlexGx]

Time.from_seconds_after_midnight/3 not validates microsecond and produce invalid Time struct,
which later can misbehave in Time.diff/3, Time.compare/2 etc.

iex> time = Time.from_seconds_after_midnight(0, {999_999_999, 6})
#Inspect.Error<
  got FunctionClauseError with message:

      """
      no function clause matching in Calendar.ISO.time_to_iodata/5
      """

  while inspecting:

      %{
        microsecond: {999999999, 6},
        second: 0,
        calendar: Calendar.ISO,
        __struct__: Time,
        minute: 0,
        hour: 0
      }
...

iex> time.microsecond
{999999999, 6}

Inspect error, but Time is constructed

[josevalim]

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